CN109545800A - A kind of display base plate and preparation method thereof, display device - Google Patents
A kind of display base plate and preparation method thereof, display device Download PDFInfo
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- CN109545800A CN109545800A CN201811406454.3A CN201811406454A CN109545800A CN 109545800 A CN109545800 A CN 109545800A CN 201811406454 A CN201811406454 A CN 201811406454A CN 109545800 A CN109545800 A CN 109545800A
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- 238000002360 preparation method Methods 0.000 title abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 323
- 239000000758 substrate Substances 0.000 claims abstract description 132
- 239000000126 substance Substances 0.000 claims abstract description 62
- 238000004519 manufacturing process Methods 0.000 claims abstract description 44
- 230000005540 biological transmission Effects 0.000 claims abstract description 13
- 239000011347 resin Substances 0.000 claims description 9
- 229920005989 resin Polymers 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 238000005530 etching Methods 0.000 claims description 7
- 230000007423 decrease Effects 0.000 claims description 6
- 230000000717 retained effect Effects 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 2
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 229920002120 photoresistant polymer Polymers 0.000 description 15
- 230000003287 optical effect Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 230000007704 transition Effects 0.000 description 3
- 239000002904 solvent Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body
- H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
- H01L27/1259—Multistep manufacturing methods
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body
- H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
- H01L27/1248—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs with a particular composition or shape of the interlayer dielectric specially adapted to the circuit arrangement
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Materials For Photolithography (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
The present invention discloses a kind of display base plate and preparation method thereof, display device, is related to field of display technology, to solve the problem of that the deeper via hole made in existing display device is easy to have an impact the yield of display device.The production method of the display base plate includes: at least two layers of the photosensitive material layer to be formed and be stacked, and along the underlay substrate close to display base plate to the direction of separate underlay substrate, the content of photoactive substance is gradually decreased at least two layers of photosensitive material layer；At least two layers of photosensitive material layer is exposed using the mask plate for including transmission region and lightproof area, after development, position corresponding with lightproof area forms the first via hole at least two layers of photosensitive material layer, along close to underlay substrate, to the direction far from underlay substrate, the first via hole side wall corresponding with different layers photosensitive material layer is gradually reduced with angle formed by underlay substrate.Display base plate provided by the invention is used to form display device.
Description
Technical field
The present invention relates to field of display technology more particularly to a kind of display base plate and preparation method thereof, display device.
Background technique
Currently, can make deeper via hole in the preparation process of display device backboard, but form it in the via hole
When its film layer, it is easy to cause the in uneven thickness of other film layers or even generates breakpoint, to influence the yield of display device.
Summary of the invention
The purpose of the present invention is to provide a kind of display base plates and preparation method thereof, display device, existing for solving
The deeper via hole made in display device is easy the problem of having an impact to the yield of display device.
To achieve the goals above, the invention provides the following technical scheme:
The first aspect of the present invention provides a kind of production method of display base plate, comprising:
At least two layers of the photosensitive material layer being stacked is formed, along the underlay substrate close to the display base plate to far from institute
The direction of underlay substrate is stated, the content of photoactive substance gradually decreases at least two layers of photosensitive material layer；
At least two layers of photosensitive material layer is exposed using the mask plate for including transmission region and lightproof area,
After development, position corresponding with the lightproof area forms via hole at least two layers of photosensitive material layer, along close to described
Underlay substrate is to the direction far from the underlay substrate, via hole side wall corresponding with different layers photosensitive material layer and the lining
Angle formed by substrate is gradually reduced.
Further, before at least two layers of the photosensitive material layer for being formed and being stacked, the production method is also wrapped
It includes:
Make the insulating film layer with the second via hole；
Conductive film layer is made backwards to the side of the underlay substrate in the insulating film layer, the conductive film layer is located at described
Insulating film layer is backwards to the surface of the underlay substrate and the inside of second via hole；
Described the step of forming at least two layers of the photosensitive material layer being stacked, specifically includes:
At least two layers of the photosensitive material layer being stacked is formed backwards to the side of the underlay substrate in the conductive film layer；
After making the first via hole at least two layers of photosensitive material layer, the production method further include:
The exposed conductive film layer is performed etching, forms conductive pattern, then will at least two layers of photosensitive material layer
Removal.
Further, the production method further include:
To being formed with described in the first via hole, at least two layers of photosensitive material layer solidifies.
Further, described the step of forming at least two layers of the photosensitive material layer being stacked, specifically includes:
The first photosensitive material layer is formed, and soft baking is carried out to first photosensitive material layer；
The second photosensitive material layer is formed backwards to the surface of the underlay substrate in first photosensitive material layer, and to described
Second photosensitive material layer carries out soft baking, and the content of photoactive substance is less than the described first photosensitive material in second photosensitive material layer
The content of photoactive substance in the bed of material；
It is specifically included in the step of forming the first via hole at least two layers of photosensitive material layer:
First photosensitive material layer and described second are felt using the mask plate for including transmission region and lightproof area
Optical material layer is exposed simultaneously, is formed photosensitive material layer and is retained region and photosensitive material layer removal region, wherein described photosensitive
It is corresponding with the region where first via hole that material layer removes region, and the photosensitive material layer retains region and removes described the
Other regions except one via hole region are corresponding；
Developed using developer solution to first photosensitive material layer and second photosensitive material layer, will be located at described
Photosensitive material layer removes first photosensitive material layer and second photosensitive material layer removal in region, forms first mistake
Hole.
Further, at least two layers of photosensitive material layer, the photosensitive material layer farthest away from the underlay substrate includes
The photoactive substance that mass fraction is 5%~10%；And/or at least two layers of photosensitive material layer, the adjacent photosensitive material
The mass fraction difference 1%~5% of photoactive substance in the bed of material.
It further, include photosensitive resin and photoactive substance in the photosensitive material layer.
The technical solution of production method based on above-mentioned display base plate, the second aspect of the present invention provide a kind of display base
Plate is made of the production method of above-mentioned display base plate, and the display base plate includes:
At least two layers of the photosensitive material layer being stacked, along the underlay substrate close to the display base plate to far from the lining
The direction of substrate, the content of photoactive substance gradually decreases at least two layers of photosensitive material layer；
The first via hole through at least two layers photosensitive material layer, edge are provided at least two layers of photosensitive material layer
Close to the underlay substrate to the direction far from the underlay substrate, first via hole is corresponding with different layers photosensitive material layer
Side wall is gradually reduced with angle formed by the underlay substrate.
Further, first via hole is including multiple successively head and the tail perpendicular to the section on the underlay substrate direction
The line segment to connect is greater than 90 degree in the direction angulation backwards to the first vias inside between the adjacent line segment, and is less than
180 degree.
Further, at least two layers of photosensitive material layer, the photosensitive material layer farthest away from the underlay substrate includes
The photoactive substance that mass fraction is 5%~10%；And/or at least two layers of photosensitive material layer, the adjacent photosensitive material
The mass fraction difference 1%~5% of photoactive substance in the bed of material.
Based on the technical solution of above-mentioned display base plate, the third aspect of the present invention provides a kind of display device, including above-mentioned
Display base plate.
In technical solution provided by the invention, at least two layers of photosensitive material layer is first made, and along close to the display base plate
Underlay substrate to the direction far from underlay substrate, the content of photoactive substance gradually subtracts at least two layers of photosensitive material layer
It is few, then two layers of photosensitive material layer is exposed, developing forms the first via hole.Due to at least two layers photosensitive material
When the bed of material is exposed, along the direction far from underlay substrate to the direction close to underlay substrate, the light energy of exposure gradually weakens,
Therefore, for the photosensitive material layer far from underlay substrate, the light energy of exposure is stronger, the content of internal photoactive substance compared with
It is few；And for the photosensitive material layer close to underlay substrate, the light energy of exposure is weaker, the content of internal photoactive substance compared with
It is more, in this way after at least two layers photosensitive material layer is exposed, develop simultaneously, the photosensitive material layer of separate underlay substrate
The side wall of corresponding first via hole has the relatively slow angle of gradient, moreover, the first via hole formed along close to underlay substrate to remote
From on the direction of underlay substrate, angle formed by the first via hole side wall corresponding with different layers photosensitive material layer and underlay substrate by
It is decrescence small.
Using above-mentioned at least two layers of photosensitive material layer as when the planarization layer in display base plate, formed on planarization layer
First via hole has the relatively slow gradient at the via edges far from underlay substrate, and first via hole is along close to substrate base
On plate to the direction far from underlay substrate, the angle of gradient is gradually reduced, in this way when forming other film layers on planarization layer, very well
Avoid other film layers occur it is in uneven thickness or even the problems such as generate breakpoint.As it can be seen that technology provided in an embodiment of the present invention
In scheme, when made at least two layers of photosensitive material layer is as planarization layer in display base plate, it is able to ascend display base plate
Yield so that can preferably guarantee the yield of display device when applying the display base plate in display device.
In addition, in production method provided in an embodiment of the present invention, only with one piece of mask plate, by single exposure, development
Operation can form the above-mentioned planarization layer with the first via hole, do not need to carry out multiple exposure using intermediate tone mask plate, show
Shadow is realized, to preferably reduce production cost, improves production capacity.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes a part of the invention, this hair
Bright illustrative embodiments and their description are used to explain the present invention, and are not constituted improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is to generate that thicknesses of layers is uneven and the schematic diagram of film layer fracture in deep hole；
Fig. 2 a- Fig. 2 c is the first pass schematic diagram of production method provided in an embodiment of the present invention；
Fig. 3 a- Fig. 3 c is the second procedure schematic diagram of production method provided in an embodiment of the present invention；
Fig. 4 a- Fig. 4 d is that the remaining flow diagram of conductive film layer is generated in deep hole；
Fig. 5 a- Fig. 5 c shows to be provided in an embodiment of the present invention using at least two layers of photosensitive material layer as the process of interim exposure mask
It is intended to.
Appended drawing reference:
1- underlay substrate, 2- photosensitive material layer,
The first photosensitive material layer of 20-, the second photosensitive material layer of 21-,
22- third photosensitive material layer, 3- mask plate,
The first via hole of 4-, 5- photoresist layer,
50- photoresist via hole, 6- insulating film layer,
The second via hole of 60-, the other film layers of 7-,
8- conductive film layer.
Specific embodiment
Display base plate that embodiment provides in order to further illustrate the present invention and preparation method thereof, display device, are tied below
Figure of description is closed to be described in detail.
As stated in the background art, it in order to meet the need of work of display device, can generally be made in the backboard of display device
Deeper via hole.Illustratively, as shown in Figure 1, when using photoresist layer 5 as planarization layer in display device, due to
The thickness of photoresist layer 5 is thicker so that the photoresist via hole 50 formed on photoresist layer 5 have deeper depth, and compared with
The big angle of gradient, in this way when forming other film layers 7 on photoresist layer 5, other film layers 7 be easy to appear it is in uneven thickness even
Breakpoint is generated, to influence the yield of display device.It is to be appreciated that above-mentioned other film layers 7 are chosen as the anode in display device
Or cathode, but it is not limited only to this.
Based on the above issues, as shown in Fig. 2 a- Fig. 2 c, Fig. 3 a- Fig. 3 c, the embodiment of the invention provides a kind of display base plates
Production method, comprising:
Step 101, form at least two layers of the photosensitive material layer 2 being stacked, along close to display base plate underlay substrate 1 to
Direction far from underlay substrate 1, the content of photoactive substance gradually decreases at least two layers of photosensitive material layer 2.
Specifically, the different photosensitive material of photoactive substance content can be used, sequentially form at least two layers sense being stacked
Optical material layer 2.It is to be appreciated that photoactive substance includes: Photoactive compounds (PAC), PAC is a kind of inhibitor, in photosensitive material layer 2
Before exposure, PAC is able to suppress photosensitive material layer 2 and dissolves in developer solution, and after the exposure of photosensitive material layer 2, PAC can accelerate to show
Shadow liquid is to the solution rate of photosensitive material layer 2, and when solidifying to photosensitive material layer 2, PAC can effectively promote photosensitive material
The switching performance of layer 2.
Step 102, using include transmission region and lightproof area mask plate 3 at least two layers of photosensitive material layer 2 into
Row exposure, after development, position corresponding with lightproof area forms the first via hole 4 at least two layers of photosensitive material layer 2, along close
Underlay substrate 1 is to the direction far from underlay substrate 1, the first via hole 4 side wall corresponding with different layers photosensitive material layer 2 and substrate base
Angle formed by plate 1 is gradually reduced.
In more detail, after having made at least two layers of photosensitive material layer 2 (as shown by figures 2 a and 3), using including
The mask plate 3 of transmission region and lightproof area is carried out while being exposed, specific exposure process at least two layers of photosensitive material layer 2
Are as follows: as shown by figures 2 b and 3b, mask plate 3 and at least two layers of photosensitive material layer 2 are aligned, the shading of mask plate 3 is made
Region is corresponding with 4 forming region of the first via hole of at least two layers photosensitive material layer 2, by the transmission region of mask plate 3 and institute
It is corresponding to state other regions of at least two layers of the photosensitive material layer 2 in addition to 4 region of the first via hole, then by mask plate 3 to described
At least two layers of photosensitive material layer 2 is exposed；To described after at least two layers of photosensitive material layer 2 is exposed, such as Fig. 2 c and 3c institute
Show, developed using developer solution at least two layers of photosensitive material layer 2, will at least two layers of photosensitive material layer 2 with
The corresponding part removal of the lightproof area of mask plate 3, forms the first via hole 4.
It is noted that it is described at least two layers of photosensitive material layer 2 is exposed when, light exposure should meet guarantee upper layer sense
While optical material layer 2 exposes appropriate, lower layer's photosensitive material layer 2 can also expose completely, to reduce overexposure or not complete
The risk exposed entirely.
Due to it is described at least two layers of photosensitive material layer 2 is exposed when, along the direction far from underlay substrate 1 to close
The light energy in the direction of underlay substrate 1, exposure gradually weakens, therefore, for the photosensitive material layer 2 far from underlay substrate 1, exposure
Light energy it is stronger, the content of internal photoactive substance is less；And for the photosensitive material layer 2 close to underlay substrate 1, exposure
Light energy it is weaker, the content of internal photoactive substance is more, in this way at least two layers of photosensitive material layer 2 simultaneously into
After row exposure, development, the inner wall of corresponding first via hole 4 of photosensitive material layer 2 far from underlay substrate 1 has the relatively slow gradient
(i.e. the first via hole 4 has the relatively slow gradient close to the part of edge), moreover, the first via hole 4 formed is along close to substrate
On substrate 1 to the direction far from underlay substrate 1, the first via hole 4 side wall corresponding with different layers photosensitive material layer 2 and underlay substrate
Angle formed by 1 is gradually reduced.
When by above-mentioned at least two layers of photosensitive material layer 2 as planarization layer in display base plate, formed on planarization layer
The first via hole 4 there is the relatively slow gradient at the via edges far from underlay substrate 1, and first via hole 4 is along close
On underlay substrate 1 to the direction far from underlay substrate 1, the angle of gradient is gradually reduced, in this way when forming other films on planarization layer
When layer, other film layers are avoided well and the problems such as in uneven thickness or even generation breakpoint occur.As it can be seen that being implemented using the present invention
When the production method that example provides makes display base plate, made at least two layers of photosensitive material layer 2 is as flat in display base plate
When smoothization layer, it is able to ascend the yield of display base plate, so that when applying the display base plate in display device, it can
Preferably guarantee the yield of display device.
In addition, in production method provided in an embodiment of the present invention, only with one piece of mask plate 3, by single exposure, development
Operation can form the above-mentioned planarization layer with the first via hole 4, not need photosensitive at least two layers using intermediate tone mask plate 3
Material layer carries out multiple exposure, development to realize, to preferably reduce production cost, improves production capacity.
In addition to the above-mentioned problems, deeper via hole is made in display device can also lead to the problem of another, such as Fig. 4 a- Fig. 4 d
It is shown, in the interim exposure mask by photoresist layer 5 as production display base plate, the is first formd on thicker insulating film layer 6
Two via holes 60, have then sequentially formed conductive film layer 8 and photoresist layer 5 on insulating film layer 6, due to the depth of the second via hole 60
It is relatively deep, therefore, when forming photoresist layer 5, due to the mobility of photoresist, the photoresist being located in the second via hole 60 can be made
Layer 5 has thicker thickness, and in this way after photoresist layer 5 is exposed, is developed, the bottom of the second via hole 60 is easy residual light
Photoresist (such as Fig. 4 b), so that when being performed etching to the conductive film layer 8 being located in the second via hole 60, remaining photoresist meeting
Covering is located at the partially electronically conductive film layer 8 (such as Fig. 4 c) in the second via hole 60, causes the partially electronically conductive film layer 8 in stripping photolithography glue-line
It left behind (such as Fig. 4 d) after 5, influence the yield of display base plate.It is to be appreciated that above-mentioned conductive film layer 8 is chosen as display device
In anode, and when the conductive film layer 8 be anode when, may also include grid layer, grid between insulating film layer 6 and underlay substrate 1
Pole insulating layer, data line layer and buffer layer etc..
To solve the above-mentioned problems, in some embodiments, it as shown in Fig. 5 a- Fig. 5 c, is stacked at least being formed
Before two layers of photosensitive material layer 2, production method provided by the above embodiment further include:
Make the insulating film layer 6 with the second via hole 60；
Conductive film layer 8 is made backwards to the side of underlay substrate 1 in insulating film layer 6, conductive film layer 8 is located at the back of insulating film layer 6
To the surface of underlay substrate 1 and the inside of the second via hole 60；
The step of forming at least two layers of photosensitive material layer 2 being stacked specifically includes:
At least two layers of the photosensitive material layer 2 being stacked is formed backwards to the side of underlay substrate 1 in conductive film layer 8；
After making the first via hole 4 at least two layers of photosensitive material layer 2, production method further include:
Exposed conductive film layer 8 is performed etching, forms conductive pattern, then will at least two layers of photosensitive material layer 2 remove.
Specifically, as shown in Figure 5 a, insulating film layer 6 can be first made, then the insulating film layer 6 is patterned, forms the
Two via holes 60 then make conductive film layer 8 backwards to the side of underlay substrate 1 in insulating film layer 6, and conductive film layer 8 are located at
Insulating film layer 6 is backwards to the surface of underlay substrate 1 and the inside of the second via hole 60, then in conductive film layer 8 backwards to underlay substrate
1 side forms at least two layers of the photosensitive material layer 2 being stacked, and makes the first mistake at least two layers of photosensitive material layer 2
Hole 4；As shown in Figure 5 b, then the conductive film layer 8 being exposed by the first via hole 4 is performed etching, it will be by the exposure of the first via hole 4
Conductive film layer 8 out removes, and forms conductive pattern；As shown in Figure 5 c, it finally will at least two layers of photosensitive material layer 2 remove again.
When by above-mentioned at least two layers of conduct interim exposure mask of photosensitive material layer 2, due to the photosensitive material close to underlay substrate 1
The content of photoactive substance is higher in layer 2, so that being formed at least two layers of photosensitive material layer in the second via hole 60 close to substrate
The part of substrate 1 after development, can preferably be dissolved in developer solution, to effectively prevent remaining due to photosensitive material layer 2
In 60 bottom of the second via hole, the caused conductive film layer 8 for being located at 60 bottom of the second via hole generates remaining ask in etching process
Topic.
As it can be seen that when making display base plate using production method provided in an embodiment of the present invention, at least two layers made sense
When optical material layer 2 is as interim exposure mask, it is able to ascend the yield of display base plate, so that applying by the display base plate aobvious
When showing in device, it can preferably guarantee the yield of display device.
Further, the production method of display base plate provided by the above embodiment further include: to being formed with the first via hole 4
At least two layers of photosensitive material layer 2 solidified.
Specifically, after forming the first via hole 4 through exposure and development at least two layers of photosensitive material layer 2, can continue to described
At least two layers of photosensitive material layer 2 is solidified, to effectively eliminate at least two layers of photosensitive material layer 2, each photosensitive material
Internal stress between layer 2.
The specific number of plies of at least two layers photosensitive material layer 2 mentioned in above-described embodiment can be arranged according to actual needs, show
Example property, settable two layers of photosensitive material layer 2 or tripack material layer 2.
When two layers of photosensitive material layer 2 is arranged, as shown in figs. 2 a-2 c, in above-mentioned steps 101, formed be stacked to
The step of few two layers of photosensitive material layer 2, specifically includes:
The first photosensitive material layer 20 is formed, and soft baking is carried out to the first photosensitive material layer 20；
The second photosensitive material layer 21 is formed backwards to the surface of underlay substrate 1 in the first photosensitive material layer 20, and is felt to second
Optical material layer 21 carries out soft baking, and the content of photoactive substance is less than light in the first photosensitive material layer 20 in the second photosensitive material layer 21
The content of quick substance.
Specifically, the first photosensitive material can be first prepared, the mass fraction for the photoactive substance for including in first photosensitive material
It can be arranged according to actual needs, using first photosensitive material, coating forms the first photosensitive material layer 20, then photosensitive to first
Material layer 20 carries out soft baking keeps the first photosensitive material layer 20 more dry to remove the solvent in first photosensitive material layer 20
It is dry, there is better uniformity.Then the second photosensitive material is prepared, the content of the photoactive substance in the second photosensitive material will be lower than
Then the content of photoactive substance in first photosensitive material utilizes second photosensitive material, in the table of the first photosensitive material layer 20
Face is coated with to form the second photosensitive material layer 21, then carries out soft baking to the second photosensitive material layer 21, second photosensitive to remove this
Solvent in material layer 21 keeps the second photosensitive material layer 21 more dry, has better uniformity.
In above-mentioned steps 102, specifically included in the step of forming the first via hole 4 at least two layers of photosensitive material layer 2:
Using including the mask plate 3 of transmission region and lightproof area to the first photosensitive material layer 20 and the second photosensitive material
Layer 21 is exposed simultaneously, is formed photosensitive material layer and is retained region and photosensitive material layer removal region, wherein photosensitive material layer is gone
Except region is corresponding with the region where the first via hole 4, photosensitive material layer retains region and in addition to 4 region of the first via hole
Other regions it is corresponding；
Developed using developer solution to the first photosensitive material layer 20 and the second photosensitive material layer 21, photosensitive material will be located at
Layer 2 removes the first photosensitive material layer 20 and the removal of the second photosensitive material layer 21 in region, forms the first via hole 4.
It specifically, include light transmission using one piece after forming the first photosensitive material layer 20 and the second photosensitive material layer 21
The mask plate 3 of region and lightproof area is exposed the first photosensitive material layer 20 and the second photosensitive material layer 21 simultaneously, exposure
Amount will be determined according to the content of the thickness and photoactive substance of the first photosensitive material layer 20 and the second photosensitive material layer 21, to guarantee
While second photosensitive material layer 21 exposes appropriate, the first photosensitive material layer 20 can just expose completely；When exposure, by exposure mask
Plate 3 and the first photosensitive material layer 20 and the second photosensitive material layer 21 align, and make the lightproof area and two layers of photosensitive material of mask plate 3
The region that the first via hole 4 is formed in layer 2 is corresponding, makes in the transmission region and two layers of photosensitive material layer 2 of mask plate 3 except the first mistake
Other regions except 4 forming region of hole are corresponding, are then exposed to two layers of photosensitive material layer 2, form photosensitive material layer
Retain region and photosensitive material layer removes region, wherein photosensitive material layer removal region is opposite with the region where the first via hole 4
It answers, it is corresponding with other regions in addition to 4 region of the first via hole that photosensitive material layer retains region.
It is photosensitive to first using developer solution after being exposed to the first photosensitive material layer 20 and the second photosensitive material layer 21
Material layer 20 and the second photosensitive material layer 21 develop, and will be located at first photosensitive material layer 20 in photosensitive material layer removal region
It is removed with the second photosensitive material layer 21, forms the first via hole 4；Finally to the first photosensitive material layer 20 for being formed with the first via hole 4
Solidified with the second photosensitive material layer 21, completes the production for the first via hole 4 for having compared with gentle incline angle.
When tripack material layer 2 is arranged, as shown in Fig. 3 a- Fig. 3 c, the first photosensitive material layer 20, second can be first made
Photosensitive material layer 21 and third photosensitive material layer 22, it is then photosensitive to the first photosensitive material layer 20, second using a mask plate 3
Material layer 21 and third photosensitive material layer 22 are exposed simultaneously, after exposure recycle developer solution to the first photosensitive material layer 20,
Second photosensitive material layer 21 and third photosensitive material layer 22 develop, and are formed photosensitive through the first photosensitive material layer 20, second
First via hole 4 of material layer 21 and third photosensitive material layer 22, from Fig. 4 c, it can be seen that along close underlay substrate 1 far from
The direction of underlay substrate 1, angle formed by the first via hole 4 side wall corresponding with different layers photosensitive material layer 2 and underlay substrate 1 by
It is decrescence small.The specific manufacturing process of the first via hole 4 and two layers of photosensitive material layer of above-mentioned setting when tripack material layer 2 is arranged
2 is similar, and details are not described herein again.
In at least two layers of the photosensitive material layer 2 mentioned in above-described embodiment, photoactive substance contains in each layer photosensitive material layer 2
Amount can be arranged according to actual needs, in some embodiments, in settable at least two layers of photosensitive material layer 2, farthest away from substrate base
The photosensitive material layer 2 of plate 1 includes the photoactive substance that mass fraction is 5%~10%；And/or at least two layers of photosensitive material layer 2,
The mass fraction difference 1%~5% of photoactive substance in adjacent photosensitive material layer 2.
Specifically, it will be set as including mass fraction being 5%~10% farthest away from the photosensitive material layer 2 of underlay substrate 1
Photoactive substance, so that the content farthest away from photoactive substance in the photosensitive material layer 2 of underlay substrate 1 is lower, so that the first mistake
Hole wall corresponding with the photosensitive material layer 2 farthest away from underlay substrate 1 has the relatively slow gradient in hole 4, i.e. the first via hole 4 leans near side (ns)
Part at edge has the relatively slow gradient.Moreover, being arranged in adjacent photosensitive material layer 2 at least two layers of photosensitive material layer 2
The mass fraction difference 1%~5% of photoactive substance, so that the content difference of the photoactive substance between adjacent photosensitive material layer 2
Suitably, not only make in this way along close to underlay substrate 1 to the direction of separate underlay substrate 1, the first via hole 4 and the photosensitive material of different layers
The corresponding side wall of the bed of material 2 is gradually reduced with angle formed by underlay substrate 1, moreover, also make the first via hole 4 with it is adjacent photosensitive
It being capable of gentle transition between the corresponding side wall of material layer 2.
It is to be appreciated that at least two layers of photosensitive material layer 2, the quality of photoactive substance point in adjacent photosensitive material layer 2
Number can also differ 1%~10%, alternatively, can be set in adjacent photosensitive material layer 2, close to the photosensitive of underlay substrate 1
Between the content of photoactive substance in the content of photoactive substance in material layer 2, with the photosensitive material layer 2 far from underlay substrate 1
Ratio be greater than 1 and less than 2.
Further, photosensitive material layer 2 may include photosensitive resin and photoactive substance in above-described embodiment.
Specifically, material included by above-mentioned photosensitive material layer 2 is varied, and illustratively, photosensitive material layer 2 includes sense
Photopolymer resin and photoactive substance, it is photosensitive using photosensitive resin and photoactive substance production since photosensitive resin has good translucency
Material layer 2 enables to photosensitive material layer 2 while with good light sensitive characteristic, also has preferable light transmission.
The embodiment of the invention also provides a kind of display base plates, using the production side of display base plate provided by the above embodiment
Method production, shown display base plate include:
At least two layers of the photosensitive material layer 2 being stacked, along the underlay substrate 1 close to display base plate to far from underlay substrate
1 direction, the content of photoactive substance gradually decreases at least two layers of photosensitive material layer 2；
The first via hole 4 through at least two layers photosensitive material layer 2 is provided at least two layers of photosensitive material layer, along close to lining
Substrate 1 is to the direction far from underlay substrate 1, the first via hole 4 side wall corresponding with different layers photosensitive material layer 2 and underlay substrate
Angle formed by 1 is gradually reduced.
Due to using production method provided by the above embodiment production display base plate when, photosensitive to described at least two layers
When material layer 2 is exposed, along the direction far from underlay substrate 1 to the direction close to underlay substrate 1, the light energy of exposure is gradually
Weaken, therefore, for the photosensitive material layer 2 far from underlay substrate 1, the light energy of exposure is stronger, internal photoactive substance
Content is less；And for the photosensitive material layer 2 close to underlay substrate 1, the light energy of exposure is weaker, internal photoactive substance
Content is more, in this way after at least two layers photosensitive material layer 2 is exposed, develop simultaneously, the sense of separate underlay substrate 1
The side wall of corresponding first via hole 4 of optical material layer 2 has the relatively slow gradient；Moreover, the first via hole 4 formed is along close to substrate
On substrate 1 to the direction far from underlay substrate 1, the first via hole 4 side wall corresponding with different layers photosensitive material layer 2 and underlay substrate
Angle formed by 1 is gradually reduced.
Therefore, when by above-mentioned at least two layers of photosensitive material layer 2 as planarization layer in display base plate, on planarization layer
The first via hole 4 formed has the relatively slow gradient at the via edges far from underlay substrate 1, and first via hole 4 is on edge
Close to underlay substrate 1 to the direction far from underlay substrate 1 on, the angle of gradient is gradually reduced, in this way when forming it on planarization layer
When its film layer, other film layers are avoided well and the problems such as in uneven thickness or even generation breakpoint occur.
As it can be seen that included at least two layers of photosensitive material layer 2 is as display in display base plate provided in an embodiment of the present invention
When planarization layer in substrate, it is able to ascend the yield of display base plate, so that applying by the display base plate in display
When in part, it can preferably guarantee the yield of display device.
In addition, in display base plate provided in an embodiment of the present invention, via hole at least two layers of photosensitive material layer 2 by using
One piece of mask plate 3 can be formed by single exposure, development operation, not need to feel at least two layers using intermediate tone mask plate 3
Optical material layer carries out multiple exposure, development to realize, to preferably reduce production cost, improves production capacity.
In some embodiments, as shown in Fig. 5 a- Fig. 5 c, display base plate provided by the above embodiment can also include insulation
Film layer 6, conductive pattern；Wherein conductive pattern is made by conductive film layer 8, and conductive film layer 8 covers insulating film layer 6 and insulating film layer 6
On the second via hole 60,
Display base plate provided in an embodiment of the present invention is when using the production of above-mentioned production method, above-mentioned at least two layers photosensitive material
The bed of material 2 is also used as interim exposure mask and is covered on conductive film layer 8, due to photosensitive in the photosensitive material layer 2 of underlay substrate 1
The content of substance is higher, so that the photosensitive material layer 2 for the close underlay substrate 1 being formed in the second deeper via hole 60 is developing
Afterwards, it can be preferably dissolved in developer solution, thus effectively prevent remaining in 60 bottom of the second via hole due to photosensitive material layer 2,
The caused conductive film layer 8 for being located at 60 bottom of the second via hole leads to the problem of residual in etching process.
Further, the first via hole 4 is including multiple successively end to end perpendicular to the section on 1 direction of underlay substrate
Line segment is greater than 90 degree in the direction angulation α inside the first via hole 4 between adjacent line segment, and less than 180 degree, such as
Shown in Fig. 2 c.
Specifically, since the content of the above-mentioned at least two layers corresponding photoactive substance of photosensitive material layer 2 is different,
After overexposure, development form the first via hole 4, along close to underlay substrate 1 to the direction of separate underlay substrate 1, the first via hole 4
Side wall corresponding with different layers photosensitive material layer 2 is gradually reduced with angle formed by underlay substrate 1.In more detail, the first mistake
Hole 4 is including multiple successively end to end line segments perpendicular to the section on 1 direction of underlay substrate, is being carried on the back between adjacent line segment
It is greater than 90 degree to the direction angulation α inside the first via hole 4, and is less than 180 degree, therefore, photosensitive by above-mentioned at least two layers
When material layer 2 is as planarization layer in display base plate, the first via hole 4 formed on planarization layer is in separate underlay substrate 1
Via edges at there is the relatively slow gradient, while first via hole 4 not only along close to underlay substrate 1 to far from underlay substrate
On 1 direction, the angle of gradient is gradually reduced, and can also between first via hole 4 side wall corresponding with adjacent photosensitive material layer 2
Enough gentle transitions avoid other film layers well and uneven thickness occur in this way when forming other film layers on planarization layer
The problems such as even or even generation breakpoint.
In some embodiments, at least in two layers of photosensitive material layer 2, the photosensitive material layer 2 farthest away from underlay substrate 1 includes
The photoactive substance that mass fraction is 5%~10%；And/or at least two layers of photosensitive material layer 2, in adjacent photosensitive material layer 2
The mass fraction difference 1%~5% of photoactive substance.
Specifically, it will be set as including mass fraction being 5%~10% farthest away from the photosensitive material layer 2 of underlay substrate 1
Photoactive substance, so that the content farthest away from photoactive substance in the photosensitive material layer 2 of underlay substrate 1 is lower, so that the first mistake
Via sidewall corresponding with the photosensitive material layer 2 farthest away from underlay substrate 1 has the relatively slow gradient in hole 4, i.e. the first via hole 4 leans on
Part at proximal edge has the relatively slow gradient.Moreover, adjacent photosensitive material is arranged at least two layers of photosensitive material layer 2
The mass fraction difference 1%~5% of photoactive substance in layer 2, so that the content of the photoactive substance between adjacent photosensitive material layer 2
Difference is appropriate, not only makes in this way along close to underlay substrate 1 to the direction of separate underlay substrate 1, the first via hole 4 and different layers sense
The corresponding side wall of optical material layer 2 is gradually reduced with angle formed by underlay substrate 1, moreover, also make the first via hole 4 with it is adjacent
It being capable of gentle transition between the corresponding side wall of photosensitive material layer 2.
It is to be appreciated that at least two layers of photosensitive material layer 2, the quality of photoactive substance point in adjacent photosensitive material layer 2
Number can also differ 1%~10%, alternatively, can be set in adjacent photosensitive material layer 2, close to the photosensitive of underlay substrate 1
Between the content of photoactive substance in the content of photoactive substance in material layer 2, with the photosensitive material layer 2 far from underlay substrate 1
Ratio be greater than 1 and less than 2.
In some embodiments, above-mentioned photosensitive material layer 2 may include photosensitive resin and photoactive substance.Since photosensitive resin has
There is good translucency, photosensitive material layer 2 is made using photosensitive resin and photoactive substance, photosensitive material layer 2 is enabled to have
While having good light sensitive characteristic, also there is preferable light transmission.
The embodiment of the invention also provides a kind of display devices, including display base plate provided by the above embodiment.
Since in display base plate provided by the above embodiment, no matter included at least two layers of photosensitive material layer 2 be as aobvious
Show the planarization layer in substrate, or as interim exposure mask, be able to ascend the yield of display base plate, therefore, the present invention is implemented
For the display device that example provides when including above-mentioned display base plate, same yield with higher, details are not described herein again.
Unless otherwise defined, the technical term or scientific term that the disclosure uses should be tool in fields of the present invention
The ordinary meaning for thering is the personage of general technical ability to be understood." first ", " second " used in the disclosure and similar word are simultaneously
Any sequence, quantity or importance are not indicated, and are used only to distinguish different component parts." comprising " or "comprising" etc.
Similar word means that the element or object before the word occur covers the element or object for appearing in the word presented hereinafter
And its it is equivalent, and it is not excluded for other elements or object.The similar word such as " connection " or " connected " is not limited to physics
Or mechanical connection, but may include electrical connection, it is either direct or indirectly."upper", "lower",
"left", "right" etc. is only used for indicating relative positional relationship, and after the absolute position for being described object changes, then the relative position is closed
System may also correspondingly change.
It is appreciated that ought such as layer, film, region or substrate etc element be referred to as be located at another element "above" or "below"
When, which " direct " can be located at "above" or "below" another element, or may exist intermediary element.
In the description of above embodiment, particular features, structures, materials, or characteristics can be at any one or more
It can be combined in any suitable manner in a embodiment or example.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (10)
1. a kind of production method of display base plate characterized by comprising
At least two layers of the photosensitive material layer being stacked is formed, along the underlay substrate close to the display base plate to far from the lining
The direction of substrate, the content of photoactive substance gradually decreases at least two layers of photosensitive material layer；
At least two layers of photosensitive material layer is exposed using the mask plate for including transmission region and lightproof area, is developed
Afterwards, position corresponding with the lightproof area forms the first via hole at least two layers of photosensitive material layer, along close to described
Underlay substrate is to the direction far from the underlay substrate, first via hole side wall corresponding with different layers photosensitive material layer and institute
Angle formed by underlay substrate is stated to be gradually reduced.
2. the production method of display base plate according to claim 1, which is characterized in that it is described formation be stacked to
Before few two layers of photosensitive material layer, the production method further include:
Make the insulating film layer with the second via hole；
Conductive film layer is made backwards to the side of the underlay substrate in the insulating film layer, the conductive film layer is located at the insulation
Film layer is backwards to the surface of the underlay substrate and the inside of second via hole；
Described the step of forming at least two layers of the photosensitive material layer being stacked, specifically includes:
At least two layers of the photosensitive material layer being stacked is formed backwards to the side of the underlay substrate in the conductive film layer；
After making the first via hole at least two layers of photosensitive material layer, the production method further include:
The exposed conductive film layer is performed etching, forms conductive pattern, then will at least two layers of photosensitive material layer removal.
3. the production method of display base plate according to claim 1, which is characterized in that the production method further include:
To being formed with described in the first via hole, at least two layers of photosensitive material layer solidifies.
4. the production method of display base plate according to claim 1, which is characterized in that the formation is stacked at least
The step of two layers of photosensitive material layer, specifically includes:
The first photosensitive material layer is formed, and soft baking is carried out to first photosensitive material layer；
The second photosensitive material layer is formed backwards to the surface of the underlay substrate in first photosensitive material layer, and to described second
Photosensitive material layer carries out soft baking, and the content of photoactive substance is less than first photosensitive material layer in second photosensitive material layer
The content of middle photoactive substance；
It is specifically included in the step of forming the first via hole at least two layers of photosensitive material layer:
Using including the mask plate of transmission region and lightproof area to first photosensitive material layer and the second photosensitive material
The bed of material is exposed simultaneously, is formed photosensitive material layer and is retained region and photosensitive material layer removal region, wherein the photosensitive material
Layer removal region is corresponding with the region where first via hole, and the photosensitive material layer retains region and removes first mistake
Other regions except the region of hole are corresponding；
Developed using developer solution to first photosensitive material layer and second photosensitive material layer, will be located at described photosensitive
Material layer removes first photosensitive material layer and second photosensitive material layer removal in region, forms first via hole.
5. the production method of display base plate according to any one of claims 1 to 4, which is characterized in that described at least two
In layer photosensitive material layer, the photosensitive material layer farthest away from the underlay substrate includes the photosensitive agent that mass fraction is 5%~10%
Matter；And/or
In at least two layers of photosensitive material layer, the mass fraction difference 1% of photoactive substance in the adjacent photosensitive material layer
~5%.
6. the production method of display base plate according to any one of claims 1 to 4, which is characterized in that the photosensitive material
It include photosensitive resin and photoactive substance in the bed of material.
7. a kind of display base plate, which is characterized in that using the production such as display base plate according to any one of claims 1 to 6
Method production, the display base plate include:
At least two layers of the photosensitive material layer being stacked, along the underlay substrate close to the display base plate to far from the substrate base
The direction of plate, the content of photoactive substance gradually decreases at least two layers of photosensitive material layer；
The first via hole through at least two layers photosensitive material layer is provided at least two layers of photosensitive material layer, along close
The underlay substrate is to the direction far from the underlay substrate, first via hole side wall corresponding with different layers photosensitive material layer
It is gradually reduced with angle formed by the underlay substrate.
8. display base plate according to claim 7, which is characterized in that first via hole is perpendicular to the underlay substrate
Direction on section include multiple successively end to end line segments, backwards to the first vias inside between the adjacent line segment
Direction angulation be greater than 90 degree, and less than 180 degree.
9. display base plate according to claim 7 or 8, which is characterized in that at least two layers of photosensitive material layer, farthest
Photosensitive material layer from the underlay substrate includes the photoactive substance that mass fraction is 5%~10%；And/or
In at least two layers of photosensitive material layer, the mass fraction difference 1% of photoactive substance in the adjacent photosensitive material layer
~5%.
10. a kind of display device, which is characterized in that including the display base plate as described in any one of claim 7~9.
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| CN111796705A (en) * | 2020-05-22 | 2020-10-20 | 南昌欧菲显示科技有限公司 | Panel, preparation method thereof, touch display screen and electronic equipment |
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